TW201911114A - Optical information reading device and method for manufacturing optical information reading device - Google Patents

Abstract

An optical information reading device (10) is provided with an image-forming lens (25), and a lens-holding part (60) assembled to a holder (50) in a state in which the image-forming lens (25) is held in place. A flange undersurface (63) and end surfaces (61a, 61b) are provided to the lens-holding part (60) as reference planes along the optical axis (L1) of the image-forming lens (25). In the holder (50), the flange undersurface (63) and the and surfaces (61a, 61b) come in contact face-to-face when the lens-holding part (60) is assembled such that the light that has passed through the image-forming lens (25) forms an image on an area sensor (23), and an upper surface (54) and edge surfaces (56a, 56b) of an opening (55) are formed as guide surfaces with which the flange undersurface (63) and the end surfaces (61a, 61b) make sliding contact when the lens-holding part (60) is moved so as to follow the optical axis (L). This suppresses the influence of a one-sided blur with regard to a change of resolution measured when an optimal focus position is found by changing the relative positions of the area sensor and the image-forming lens.

Description

Optical information reading device and method of manufacturing optical information reading device

The present invention relates to an optical information reading device and a method of manufacturing the optical information reading device.

In recent years, in response to the spread of two-dimensional codes such as QR code (registered trademark), in a retail store, a convenience store, etc., a two-dimensional code attached to a ticket or the like is in a non-contact manner, for example, a system for optical reading. Always improve. Therefore, in the future, by using a region sensor in which the imaging element is two-dimensionally arranged, it is possible to predict that the introduction of the reading device capable of reading the two-dimensional code is increased not only by the barcode. On the other hand, there is still a need to read a barcode, and even a reading device that can read a two-dimensional code requires reading a barcode. Further, by using the well-known symbol recognition processing function (OCR), the need to recognize the passport information of the captured passport and the like is also increased.

Therefore, in an optical information reading apparatus having an area sensor, in order to capture and read an information code or the like at a stable distance, as an area sensor and a sensor for use in the area, an information code or the like is used. The relative position between the imaging lenses that reflect light imaging is adjusted/maintained at a predetermined focus position (best focus) by means of a lens barrel. The lens barrel is formed with a screw portion on the outer peripheral surface to assemble the image forming lens inside, and the screw portion is screwed into the bracket of the assembly area sensor. Next, the relative position of the area sensor and the imaging lens is adjusted by adjusting the amount of screwing of the lens barrel. As an optical information reading device that adjusts the relative position of the area sensor and the imaging lens by adjusting the amount of screwing, for example, an optical information reading device disclosed in Patent Document 1 is known.

In addition, in the public accommodation facilities, the locker room, the railway, and the medical care, the information code is used as an encryption code or as an authenticity determination in recent years, and the information code is used as a security measure. The demand for import has been increasing. In such an application, in addition to the visible light used as the illumination light of the prior art, a reading device that achieves improved safety by using invisible light such as infrared light exists. In addition, in the public place where the visible light is generally used as the illumination light and the illumination light is easily recognized by most people, it is often switched to invisible light such as infrared light in order to prevent glare.

As an optical information reading device that uses two types of illumination light, for example, a reading device disclosed in Patent Document 2 is known. The reading device utilizes an upconversion generated by simultaneously illuminating near-infrared light and infrared light from two different light sources, and reads high-output and high S/ when receiving reflected light from a two-dimensional transparent bar code. The N-ratio signal is made possible, which improves the information recognition ability. [Prior Technical Literature] [Patent Literature]

[Patent Document 1] JP-A-2010-039371 (Patent Document 2) JP-A-2010-039958

[Problems to be solved by the invention]

In the case of the low-cost imaging lens used in the optical information reading device, there is a case where a part of the periphery of the visual field is degraded with respect to the imaging generation performance (hereinafter, simply referred to as a single bokeh) due to variations in manufacturing or the like. . In the imaging lens in which such a single bokeh does not occur, the relative position resolution of the area sensor and the imaging lens changes, and the resolution of the measurement when the relative position becomes the optimum focus position has the highest evaluation.

However, in the imaging lens that generates a single bokeh, in the configuration in which the relative position of the area sensor and the imaging lens is adjusted in accordance with the above-described amount of screwing, the analysis is performed based on the amount of screwing per change. When the force is used to find the optimum focus position, the single bokeh portion also rotates at the center of the optical axis. When the single bokeh portion is rotated as described above, the positional resolution of the single bokeh portion also changes, and the relative position of the area sensor and the imaging lens is such that the measured resolution is low even at the optimum focus position. In this case, there is a first problem that cannot be adjusted to the optimum focus position.

On the other hand, in a reading device in which both a light source that emits visible light and a light source that emits invisible light such as infrared light are mounted, the arrangement of the light receiving sensor and the respective light sources is restricted, and usually, with respect to the imaging field of view (imaging The field of view of the visible light is different from the range of the invisible light. Therefore, when the state in which the visible light is irradiated is switched to the state in which the invisible light is irradiated, since the irradiation range of the invisible light cannot be recognized, the reading operation can be performed as the irradiation range in which the visible light can be read, because the information code is not properly When the invisible light is irradiated, there is a second problem that the reading fails in the state where the invisible light is irradiated. This second problem also occurs when the information code is simultaneously illuminated with visible light and invisible light and the information code is read. In particular, when reading an information code located at a short distance, the positional deviation between the irradiation range of visible light and the irradiation range of invisible light becomes large, and the above problem is more remarkable.

The present invention has been made to solve the above-described first problem, and an object of the present invention is to provide a configuration for suppressing a change in the analytical force measured when the relative position of the area sensor and the imaging lens is changed to obtain an optimum focus position. The effect of a single bokeh (first purpose).

The present invention has been made to solve the above-mentioned second problem, and an object of the invention is to provide a configuration capable of suppressing variations in the two irradiation ranges even when both a light source that emits visible light and a light source that emits invisible light such as infrared light are mounted. Reduced read performance (second objective). [Means for solving problems]

In order to achieve the above first object, according to a first exemplary embodiment, the optical information reading device (10) is provided with an area sensing for receiving reflected light (C) from an information code through an imaging lens (25). And (23) optically reading the foregoing information code based on a signal output by the area sensor, wherein the optical information reading device comprises: a bracket for fixing the area sensor (50, 150, 250, 350, 450 a lens holding portion (60, 160, 260, 360, 460) provided with a reference surface along the optical axis (L2) of the aforementioned imaging lens in a state in which the aforementioned imaging lens is held, and in the aforementioned bracket Forming a guiding surface that faces the reference surface when the lens holding portion is assembled such that light passing through the imaging lens is formed on the area sensor, and the aforementioned surface is along the optical axis When the lens holding portion moves, the reference surface is slid.

According to the first aspect, the lens holding portion of the holder assembled to the fixed area sensor in a state in which the imaging lens is held is provided with a reference surface along the optical axis of the imaging lens. Next, a guide surface is formed on the bracket, the guide surface is in contact with the reference surface when the lens holding portion is assembled in such a manner that the light passing through the imaging lens is imaged on the area sensor, and the lens is held along the optical axis Slide the reference plane while moving.

Thereby, when the relative position of the area sensor and the imaging lens is adjusted, the reference surface is moved along the optical axis with respect to the holder so as to be slidably contacted with the guiding surface. That is, even in the case of an imaging lens produced by a single bokeh, since the single bokeh portion does not rotate when the optimum focus position is obtained by changing the relative position of the area sensor and the imaging lens, the change in the measured resolution can be Suppress the effects of a single bokeh.

In the first aspect described above, according to an example, the area sensor has a rectangular light receiving surface, and the position where the single bokeh is generated can be grasped in each of the imaging lenses. Next, the lens holding portion holds the imaging lens such that the portion of the field of view generated by the single bokeh is located outside the light receiving surface on the long side of the light receiving surface. Thereby, unlike the case where the portion of the field of view generated by the single bokeh is held on the short side of the light receiving surface, the portion of the field of view generated by the single bokeh can be easily located outside the imaging field of the area sensor. It is possible to suppress the influence of a single bokeh and increase the resolution.

Further, according to another example, the reference plane is composed of a planar first reference surface and a planar second reference surface that intersects the first reference surface; and the guide surface is planarly slidably coupled to the first reference surface. The first guiding surface and the planar second guiding surface that can be slidably coupled to the second reference surface are formed. Thereby, by configuring the reference surface and the guide surface in two planes, the lens holding portion can be easily realized in a configuration that moves along the optical axis with respect to the holder.

Further, according to another example, the flange portion of the lens holding portion functions as a first reference surface at least a part of a plane on the imaging lens side, and the holder also forms an imaging lens in the lens holding portion than the flange portion at the time of assembly. The side portion is formed by the opening, and at least a part of the plane forming the opening acts as the first guiding surface. Thereby, it is not easy to perform assembly of the lens holding portion to the holder, and it is easy to bring the first reference surface into contact with the first guiding surface at the time of assembly.

Further, it is more preferable that the flange portion is formed to cover the opening on the plane which becomes the imaging lens side at the time of sliding. Thereby, since the flange portion functions as a light blocking portion that prevents incidence of light passing through the opening, the light shielding property of the bracket can be improved.

Further, according to a second aspect, a method of manufacturing an optical information reading device for manufacturing the optical information reading device (10) includes: holding the lens holding portion of the imaging lens, and fixing the area sensor The bracket is assembled in such a manner that the reference surface faces the guide surface; the arm (510) movable along the optical axis is assembled to the lens holding portion; and the reference surface is slidably coupled to the guide In the manner of the leading surface, the arm is moved in the direction along the optical axis, and the resolving power of the area sensor is measured in sequence; the measured resolving power is regarded as the peak position of the peak, and the aforementioned The lens holding portion in the state of the arm is fixed to the work of the holder; the process of detaching the arm from the lens holding portion.

In the second aspect, the lens holding portion that holds the imaging lens is assembled with the holder to which the area sensor is attached so that the reference surface is surface-contacted with the guide surface, and the arm movable along the optical axis The lens holding portion is assembled, and the arm is moved in the direction along the optical axis while the reference surface is slidably attached to the guide surface, and the resolution of the area sensor is sequentially measured, and the measured resolution is regarded as the peak value. The peak position is attached to the holder by the lens holding portion in the state of the assembled arm, and the arm is detached from the lens holding portion.

Therefore, when the lens holding portion is fixed to the holder at the peak position, the lens holding portion is less likely to be displaced from the peak position because the arm is assembled in the lens holding portion, and the optimum focus obtained by measuring the analytical force can be surely performed. Adjustment of position.

Further, in the second aspect, for example, in the process of fixing the lens holding portion to the holder, the peak position is obtained by moving the arm in the first direction along the optical axis so as not to exceed the peak position. After moving the arm in the second direction along the optical axis, the arm is again moved in the first direction toward the peak position, and the lens holding portion is fixed to the holder at the peak position.

When the moving direction of the arm is switched from the first direction to the second direction, there is a case where the actuator lens holding portion does not move due to the gap of the actuator for moving the arm, and the like. In the case where the lens holding portion is moved in the other direction while being moved toward the first direction, the lens holding portion may be fixed to a position deviated from the peak position. Here, when the peak position is obtained while moving in the first direction, the arm is moved in the second direction along the optical axis so as to exceed the peak position, and then the arm is moved in the first direction toward the peak position. At the position, the lens holding portion is fixed to the holder, whereby the occurrence of the above-described deviation from the peak position can be prevented, and the adjustment to the optimum focus position can be performed more surely.

Further, for example, in the process of sequentially measuring the resolution, the amount of movement of the arm when the analysis force of a predetermined value or more is measured is smaller than the amount of movement of the arm when the analysis force of a predetermined value is not measured. As a result, the measurement measurement time until the vicinity of the peak position is shortened, and the measurement measurement accuracy in the vicinity of the peak position is improved, and both the measurement time reduction and the measurement accuracy can be improved.

In order to achieve the above second object, according to the third aspect, an optical information reading device (10) is provided with a region for receiving reflected light from the information code (C) on a rectangular light receiving surface (23a). And (23) optically reading the information code based on the signal output by the area sensor, wherein the optical information reading device (10) is provided with: an imaging field of view (AR) illumination toward the area sensor as illumination a first light source (21) that emits visible light (Lf1) and a second light source (22) that emits invisible light (Lf2); and the first light source and the second light source are arranged in a line along the short-side direction of the light-receiving surface.

In the third aspect, the area sensor that receives the reflected light from the information code on the rectangular light receiving surface, and the first light source that illuminates the visible light as the illumination light toward the imaging field of the area sensor and The second light source that emits invisible light is disposed in a line along the short side direction of the light receiving surface.

In this way, the irradiation range of the visible light and the irradiation range of the invisible light are less likely to shift with respect to the longitudinal direction of the imaging field of view with respect to the imaging field of view in which the shape of the light receiving surface is rectangular. Generally, when reading an information code elongated in one direction such as a barcode, the long side direction of the information code is read in a manner consistent with the long side direction of the imaging field, that is, the long side direction of the reading port. The port is oriented towards the status of the information code. In this state, since the irradiation range of the visible light with respect to the information code and the irradiation range of the invisible light are not shifted in the longitudinal direction of the imaging field of view, it is possible to suppress the reading caused by the shift of the two irradiation ranges in the longitudinal direction of the imaging field of view. The failure is, for example, a reading failure or the like which is caused by the invisible light being irradiated to one side in the longitudinal direction of the information code but not irradiated to the other side in the long side direction. Therefore, even when both the first light source that emits visible light and the second light source that emits invisible light are mounted, it is possible to suppress a decrease in read performance due to variations in the two irradiation ranges.

Further, in the third aspect, the first light source and the second light source are disposed such that the light receiving optical axis of the area sensor is located between the first light source and the second light source. Thereby, the center of the imaging field of view and the center of the irradiation range of the visible light and the center of the irradiation range of the invisible light are close to each other in the short-side direction of the imaging field of view, and the shift between the imaging field of view and the two irradiation ranges can be made more. To reduce it, it can improve read performance.

In another example, the first light source and the second light source are disposed to be offset from the imaging lens in the longitudinal direction of the light receiving surface. In this way, even if the first light source and the second light source are disposed so as to be close to each other in the short-side direction of the light-receiving surface, the imaging lens is not disturbed, and the first light source and the second light source can be arranged in close proximity. Miniaturization.

In another example, since the first light source and the second light source are mounted on the same illuminating substrate, the first light source and the second light source can be easily removed without suppressing the positional deviation between the first light source and the second light source. Compact configuration for miniaturization of the unit.

In another example, since the illumination lens for the first light source and the illumination lens for the second light source are integrally formed, the number of components of the illumination lens can be reduced, and the first light source and the first light source can be easily 2 The light source is compactly arranged to achieve miniaturization of the device.

In another example, the first light source and the second light source are disposed such that the irradiation range of the first light source is lower than the irradiation range of the second light source when the user observes. Generally, when the reading port is oriented toward the information code displayed on the predetermined display surface, the user observes the information code through the reading port while performing the reading operation, and the predetermined display surface is easily read from the upper side with respect to the light receiving optical axis. The state of the mouth is relatively inclined while being away from the mouth. In this state, the folded-back field of view through the predetermined display surface is on the upper side with respect to the light-receiving optical axis, and the first light source of the visible light whose intensity is higher than the invisible light is located above the light-receiving optical axis. 1 The light source becomes easy to enter the above-mentioned folded-back view. In other words, since the reflection on the predetermined display surface is easily reflected, visible light may be reflected on the imaged information code, and the reading performance may be lowered.

Here, when the user views the user, the first light source and the second light source are disposed such that the irradiation range of the first light source is lower than the irradiation range of the second light source, and the first light source becomes difficult to enter. By the above-described predetermined retracted view of the display surface, it is possible to suppress a decrease in the reading performance due to the reflection of visible light having a strong light intensity. Further, the symbols in the respective brackets indicate the correspondence relationship with the specific elements described in the embodiments to be described later.

Hereinafter, embodiments of various aspects of an optical information reading apparatus having a configuration for solving the above-described problems and a method of manufacturing the same will be described with reference to the accompanying drawings. [First Embodiment] Hereinafter, an optical information reading apparatus according to a first embodiment of the present invention will be described with reference to the drawings. The optical information reading apparatus 10 of the present embodiment is configured as an information reading machine that optically reads an information code C such as a one-dimensional code or a two-dimensional code. Here, as the one-dimensional code, for example, a barcode composed of JAN code, EAN, UPC, ITF code, CODE 39, CODE 128, NW-7, or the like is intended. Further, as a two-dimensional code, for example, a square information code such as a QR code, a data matrix code, a Maxi code, or an Aztec code is intended.

In the optical information reading device 10, the circuit unit 20 is housed inside the case CS. The circuit unit 20 mainly includes an optical system such as an illumination light source 21, a marker light irradiation unit 22, and an area sensor 23, a memory 35, and a control unit. 40 and other microcomputer (hereinafter referred to as "microcomputer") system.

The optical system is divided into a light projecting optical system and a light receiving optical system. The light projecting optical system is composed of an illumination light source 21 and a mark light irradiation unit 22. The illumination light source 21 functions as an illumination light source capable of emitting illumination light Lf, and is constituted, for example, by an LED and a lens provided on the emission side of the LED.

The marker light irradiation unit 22 functions as a marker light source that can illuminate the marker light Lm indicating the center of the imaging range of the area sensor 23, and is configured, for example, by an LED and a lens provided on the emission side of the LED. In addition, FIG. 1 conceptually shows an example in which the illumination light Lf and the marker light Lm are irradiated to the reading target R to which the information code C is attached.

The light receiving optical system is composed of a region sensor 23, an imaging lens 25, and the like. The area sensor 23 is, for example, a light-receiving sensor having a rectangular light-receiving surface 23a in which a light-receiving element of a solid-state imaging element such as a C-MOS or a CCD is arranged two-dimensionally, and can be configured to capture an information code C. The electrical signals corresponding to the intensity of the reflected light Lr are outputted in each unit (pattern) of the received information code. The area sensor 23 is mounted on the sensor substrate 20a in such a manner as to receive incident light incident through the imaging lens 25.

The imaging lens 25 is configured to have one or two or more lenses, and functions as an imaging optical system that collects incident light incident from the outside through the reading port 13 and can image the light receiving surface 23a of the area sensor 23. In the present embodiment, the illumination light Lf irradiated from the illumination light source 21 is reflected by the information code C or the reading target R to which the information code C is attached, and the reflected light Lr is collected by the imaging lens 25 to be used in the area sensor. The light receiving surface 23a of 23 images the code image.

Further, in the light receiving optical system, as shown in FIGS. 2 to 4, a holder 50 that fixes the sensor substrate 20a and a lens holding portion 60 that holds the imaging lens 25 are provided. Further, the direction along the optical axis L of the area sensor 23 and the imaging lens 25 is set to the X direction, and is parallel to a plane in which the upper surface 54 of the holder 50 to be described later is in surface contact with the flange lower surface 63 of the lens holding portion 60. The direction in which the direction of the X direction is the Y direction and the direction perpendicular to the X direction and the Y direction is the Z direction will be described below.

As shown in FIGS. 2(A) to (C), the holder 50 is formed in a slightly box shape, and one end portion 51 is opened to fix the sensor substrate 20a, and the sensor is fixed by covering the opening. The substrate 20a accommodates the area sensor 23 mounted on the sensor substrate 20a in the holder 50. Further, in the holder 50, the other end portion 52 opposed to the light receiving surface 23a of the area sensor 23 is provided with a circular opening 52a centering on the optical axis L1 of the area sensor 23. In order to improve the light blocking property of the holder 50, the opening 52a is formed so as to expose only the imaging lens 25 held by the lens holding portion 60 and its vicinity when viewed from the optical axis L1 direction.

Further, as shown in Figs. 2(A) to (C), the upper portion of the holder 50 is provided along the optical axis of the area sensor 23 between the pair of edge portions 53 extending in the X direction. L1 is formed, and a rectangular opening 55 is provided in the center thereof. The opening 55 is slid along the optical axis L1 of the area sensor 23 in the Y direction and is slidably attached to the lens holding portion 60 at the time of sliding adjustment, which will be described later, on the edge surfaces 56a and 56b perpendicular to the upper surface 54 to be limited to The length in the Y direction is set so as to move in a direction in which the direction of the optical axis L1 of the lens holding portion 60 is different. Further, the opening 55 sets the length in the X direction in response to the length of the sliding of the lens holding portion 60 at the time of the slide adjustment. Further, the pair of edge portions 53 are formed with bonding grooves 53a for adhesion fixing by sliding adjustment. Further, the upper surface 54 may correspond to an example of the "guide surface" and the "first guide surface", and the edge surfaces 56a and 56b may correspond to an example of the "guide surface" and the "second guide surface".

As shown in FIGS. 3A to 3C , the lens holding portion 60 includes a holding portion main body 61 that holds the imaging lens 25 and a flange portion 62 that is coupled to the upper portion of the holding portion main body 61 . The imaging lens 25 is held by the holding portion body 61 as will be described later in consideration of the position at which a single bokeh is generated. The holding portion main body 61 is slidable along the edge faces 56a, 56b of the opening 55 along the optical axis L2 of the imaging lens 25 by the both end faces 61a, 61b on the Y-direction side in the vicinity of the flange portion 62, and is a vertical flange The following 63 is formed. Further, the end faces 61a and 61b can correspond to an example of the "reference plane" and the "second reference plane".

The flange portion 62 has a substantially flat shape, and sets the length in the Y direction so as to be slidably attached to the edge portion 53 during the slide adjustment, and becomes the flat surface 63 of the flange on the side of the imaging lens 25 to follow the optical axis of the imaging lens 25. The form of L2 is formed. The flange lower surface 63 is set to the imaging lens 25 in such a manner that the optical axis L2 of the imaging lens 25 and the optical axis L1 of the area sensor 23 coincide with each other as the optical axis L at the time of sliding contact with the upper surface 54 of the holder 50. The length in the Z direction up to the optical axis L2. Further, the flange portion 62 is always set to have a length in the X direction so as to cover the opening 55 at the flange bottom surface 63 during the sliding contact. Further, on the upper surface of the flange portion 62, a pair of concave engaging portions 64 for sliding adjustment and a pair of bonding grooves 65 for fixing by sliding adjustment are formed. The bonding groove 65 is formed to be longer than the bonding groove 53a in the X direction so that it can communicate with the bonding groove 53a at any sliding adjustment position. Further, the flange lower surface 63 can correspond to an example of the "reference surface" and the "first reference surface".

Next, as shown in FIGS. 4(A) to 4(C), the lens holding portion 60 is configured such that the end faces 61a and 61b and the edge faces 56a and 56b are respectively in contact with the upper surface 54 of the flange 63 when assembled to the holder 50. In the state of the surface contact, the holding portion main body 61 on the side of the imaging lens 25 than the flange portion 62 is housed in the holder 50 through the opening 55. Next, as described later, the lens holding portion 60 is slidably adjusted in the X direction by the two engaging portions 64 so that the relative positions of the area sensor 23 and the imaging lens 25 are optimal focus positions, and then borrowed. The UV-adhering agent or the like is applied from the bonding groove 65 to the bonding groove 53a, and the lens holding portion 60 is assembled to the holder 50 so as not to slide.

The microcomputer system includes an amplifier circuit 31, an A/D converter 33, a memory 35, an address generation circuit 36, a synchronization signal generation circuit 38, a control unit 40, an operation unit 42, a liquid crystal display 43, a buzzer 44, and a vibrator 45. The light emitting unit 46, the communication interface 48, and the like are configured. The microcomputer system is configured to be mainly composed of a control unit 40 and a memory 35 that function as a microcomputer (information processing device), and can perform hard and soft image signals of the information code captured by the optical system. Signal processing. Further, the control unit 40 also performs control of the entire system of the optical information reading device 10.

The image signal (analog signal) output from the area sensor 23 of the optical system is input to the amplifying circuit 31 and amplified at a predetermined amplification factor, and then input to the A/D converter 33 to be converted from the analog signal to the digital signal. Then, the digitized video signal is generated, that is, the video data (image information) is input to the memory 35, and then accumulated in a predetermined code image information storage area. Further, the synchronizing signal generating circuit 38 is constructed in such a manner as to generate a synchronizing signal to the area sensor 23 and the address generating circuit 36, and the address generating circuit 36 is based on the synchronizing signal supplied from the synchronizing signal generating circuit 38. The storage address of the image data stored in the memory 35 is generated.

The memory 35 is a semiconductor memory device such as a RAM (DRAM, SRAM, etc.) or a ROM (EPROM, EEPROM, etc.). In the RAM in the memory 35, the control unit 40 is configured to be able to secure a work area or a read condition table for each process such as arithmetic calculation and logical calculation, in addition to the above-described code image information storage area. Further, in the ROM, a reading program capable of performing reading processing for optically reading the information code, a system program for controlling each hardware such as the illumination light source 21 and the area sensor 23, and the like are stored in advance.

The control unit 40 is configured by a CPU, a system bus, an input/output interface, and the like, and can form an information processing device together with the memory 35 to have an information processing function. The control unit 40 functions to perform interpretation processing (decoding) on the code image of the information code recorded by the area sensor 23 and memorized in the memory 35. Further, the control unit 40 is configured to be connectable to various input/output devices (peripheral devices) via a built-in input/output interface, and in the case of the present embodiment, the operation unit 42, the liquid crystal display 43, the buzzer 44, and the vibration are connected. The device 45, the light emitting unit 46, the communication interface 48, and the like.

The operation unit 42 is composed of a plurality of keys, and an operation signal is given to the control unit 40 in response to a user's key input operation. When the control unit 40 receives an operation signal from the operation unit 42, the control unit 40 performs an operation corresponding to the operation signal. The liquid crystal display 43 is constituted by a known liquid crystal display panel, and the control unit 40 controls the display content. The buzzer 44 is constituted by a known buzzer, and a predetermined sound is generated in response to an operation signal from the control unit 40. The vibrator 45 is constituted by a known vibrator mounted on the portable device, and vibrates in response to a drive signal from the control unit 40. The light-emitting portion 46 is, for example, an LED, and is illuminated by a signal from the control unit 40. The communication interface 48 is configured as an interface for performing material communication with the outside (for example, a host device), and performs communication processing in cooperation with the control unit 40.

Next, a detailed configuration of the holder 50 and the lens holding portion 60 will be described. As described above, in the imaging lens, there is a case where a part of the periphery of the visual field is degraded with respect to imaging generation performance due to variations in manufacturing or the like. Therefore, in the former configuration in which the relative position of the area sensor 23 and the imaging lens 25 is read in order to maintain the amount of screwing of the holder H of the lens barrel B of the imaging lens 25, the adjustment is made like the imaging field P illustrated in FIG. The single bokeh portion S is also rotated about the optical axis L (see the arrow of FIG. 6). When the single bokeh portion S is rotated in this manner, the positional resolution of the single bokeh portion S also changes, and the relative position of the region sensor 23 and the imaging lens 25 is measured at a low resolution even at the optimum focus position. The situation.

Here, in the present embodiment, by using the holder 50 and the lens holding portion 60, the imaging lens 25 is slid along the optical axis L with respect to the area sensor 23, and the relative position is adjusted. That is, the lens holding portion 60 is in the light with respect to the holder 50 in a state in which the end faces 61a, 61b are respectively slidably attached to the edge faces 56a, 56b of the opening 55 while the lower surface 63 of the flange is slidably attached to the upper surface 54. Guided by the sliding in the axial direction (X direction), the relative position of the imaging lens 25 and the area sensor 23 can be adjusted in such a manner that the imaging lens 25 is not rotationally moved.

Then, the lens holding portion 60 is gradually slid to the holder 50 in a state in which the predetermined jig is engaged with the two engaging portions 64 formed in the flange portion 62, and the resolving force is sequentially measured. The influence of the single astigmatism is suppressed by the change in the analytic force measured in this way, and the sliding position (relative position) which is the highest evaluation as the analytic force is the optimum focus position, and the position after the adjustment from the lens holding portion 60 is The bonding groove 65 is applied to the bonding groove 53a of the holder 50 by applying a UV adhesive or the like to be bonded and fixed. Thereby, the lens holding portion 60 is assembled so as not to be slidable with respect to the bracket 50 at an optimum focus position.

In particular, in the present embodiment, by grasping the position where the single bokeh is generated in each of the imaging lenses 25, it is known from the imaging field of view P illustrated in Fig. 5 that the single bokeh portion S is on the long side of the light receiving surface 23a. The imaging lens 25 is held by the lens holding portion 60 in such a manner as to be outside the light receiving surface 23a. Thereby, even when the lens holding portion 60 is slid with respect to the holder 50 and the resolving power is measured, it is possible to suppress the single bokeh portion S from being imaged.

As described above, the optical information reading apparatus 10 of the present embodiment is provided with the flange lower surface 63 and the end surface 61a, 61b as the image along the lens holding portion 60 which is assembled to the holder 50 in a state in which the imaging lens 25 is held. The reference plane of the optical axis L1 of the lens 25. Next, the rim faces 56a, 56b of the upper surface 54 and the opening 55 are formed as the guide faces, and the guide faces are assembled when the lens holding portion 60 is assembled in such a manner that the light passing through the imaging lens 25 is imaged on the area sensor 23. The flange lower surface 63 and the end surfaces 61a and 61b are contacted, and the flange holding surface 60 and the end surfaces 61a and 61b are slidably moved while moving the lens holding portion 60 along the optical axis L.

Thereby, when the relative position of the area sensor 23 and the imaging lens 25 is adjusted, the flange lower surface 63 and the end surfaces 61a, 61b are slidably attached to the upper surface 54 and the edge surfaces 56a, 56b of the opening 55, respectively. The holding portion 60 moves along the optical axis L with respect to the holder 50. That is, even if the imaging lens 25 that generates the single bokeh is rotated, the single bokeh portion S does not rotate when the relative position of the area sensor 23 and the imaging lens 25 is changed and the optimum focus position is obtained, with respect to the measured The change in resolution can suppress the effects of a single bokeh.

Further, the area sensor 23 has a rectangular light receiving surface 23a, and it is possible to grasp the position where the single bokeh is generated in each of the imaging lenses 25. Next, the lens holding unit 60 holds the imaging lens 25 such that the single bokeh portion S is located outside the light receiving surface 23a on the long side of the light receiving surface 23a. With this, unlike the case where the single bokeh portion S is held by the imaging lens in such a manner as to be located on the short side of the light receiving surface, the single bokeh portion S can be easily placed outside the imaging field of the area sensor 23, and single bokeh can be suppressed. The impact of the resolution increases.

Further, even if the position where the single bokeh is generated cannot be grasped in each of the imaging lenses 25, since the single bokeh portion S is not rotated by the lens holding portion 60 and the holder 50, even if the single bokeh portion S is located on the light receiving surface On the inner side of 23a, the influence of the single bokeh can also be suppressed with respect to the change in the measured resolution.

In particular, the reference surface on the lens holding portion 60 side has a flange bottom surface 63 that functions as a planar first reference surface, and end faces 61a and 61b that act as a planar second reference surface that is perpendicular to the first reference surface. The guide surface on the side of the holder 50 is composed of a flat surface 54 that functions as a first first guide surface that can be slidably contacted by the first reference surface, and a second guide that can be slidably connected as a second reference surface. The edge faces 56a, 56b of the opening 55 acting as a face are formed. Therefore, the configuration in which the lens holding portion 60 is moved along the optical axis L with respect to the holder 50 can be realized simply by forming the reference surface and the guiding surface in two types of planes.

Further, the first reference surface and the second reference surface on the side of the lens holding portion 60 are perpendicularly arranged at a non-90° vertical direction, and the first reference surface and the second reference surface are slidably connected to the intersecting state. The first guide surface and the second guide surface on the side of the holder 50 can be configured to smoothly move the lens holding portion 60 along the optical axis L with respect to the holder 50.

In addition, the flange portion 62 of the lens holding portion 60 functions as the first reference surface on the flange bottom surface 63 on the side of the imaging lens 25, and the holder 50 is further formed by the lens holding portion 60 than the flange portion 62 at the time of assembly. The holding portion main body 61 on the imaging lens 25 side is formed to be accommodated by the opening 55, and the upper surface 54 forming the opening 55 functions as a first guiding surface. Thereby, it is not only easy to assemble the lens holding portion 60 of the holder 50, but also the first reference surface and the first guiding surface are easily brought into contact with each other during the assembly.

Further, the flange portion 62 is formed to cover the opening 55 at the flange lower surface 63 at the time of sliding. Thereby, since the flange portion 62 functions as a light blocking portion that prevents incidence of light passing through the opening 55, the light blocking property of the bracket 50 can be improved.

Further, since the lens holding portion 60 is provided with a pair of concave engaging portions 64 that are used when moving along the optical axis L with respect to the holder 50, the lens holding portion 60 along the optical axis L can be accurately performed. With respect to relative movement, adjustment to the optimum focus position can be reliably performed. Further, the engaging portion 64 is not limited to being formed in a concave shape, and may be formed in a convex shape if it can be engaged with the shape of the jig for sliding adjustment.

[Second Embodiment] Next, an optical information reading apparatus according to a second embodiment will be described with reference to Figs. 7 and 8 . In the second embodiment, the bracket 150 and the lens holding portion 160 are mainly used in place of the above-described bracket 50 and lens holding portion 60, which is different from the above-described first embodiment.

Specifically, as shown in FIG. 7 and FIG. 8 , the lens holding portion 160 of the imaging lens 25 is placed on the upper portion of the outer peripheral surface (outer surface) 161 having a circular cross section when viewed from the surface passing through the optical axis L. The convex portion 162 extending in the axial direction is formed. Further, a flange portion 163 for use in sliding adjustment is provided on the reading port 13 side of the lens holding portion 160.

Further, the holder 150 of the fixed area sensor 23 omits the opening 55 with respect to the above-described holder 50, and forms an opening 152 which is slidably attached to the outer peripheral surface 161 of the lens holding portion 160 at the end portion 151, at the upper portion of the opening 152. A concave portion 153 that is slidably attached to at least a part of the upper surface and the side surface of the convex portion 162 of the lens holding portion 160 is formed.

In the present embodiment, the first reference surface and the second reference surface are formed by the outer circumferential surface 161 of the lens holding portion 160 and the convex portion 162 provided on the outer circumferential surface 161, and the first guiding surface and the second surface. The guide surface is formed by the edge surface of the opening 152 provided in the holder 150 and the recess 153 provided in the opening 152.

Even in such a configuration, when the relative position of the area sensor 23 and the imaging lens 25 is adjusted, the outer peripheral surface 161 and the convex portion 162 can be made to be opposite to each other with respect to the opening 152 and the concave portion 153, so that the lens holding portion 160 is opposed to each other. The holder 150 is moved along the optical axis L. Therefore, since the single bokeh portion S does not rotate when the optimum focus position is obtained by changing the relative position of the area sensor 23 and the imaging lens 25, the influence of the single bokeh can be suppressed with respect to the change in the measured resolution.

Further, the lens holding portion 160 is formed so as to be slidably attached to the opening 152 of the holder 150 at a lower portion of the outer peripheral surface 161, and the upper surface and the side surface of the convex portion 162 may be configured to function as the first reference surface and the second reference surface. .

[Third Embodiment] Next, an optical information reading apparatus according to a third embodiment will be described with reference to Figs. 9 and 10 . In the third embodiment, the bracket 50 and the lens holding portion 260 are mainly used in place of the above-described bracket 50 and lens holding portion 60, which is different from the above-described first embodiment.

Specifically, as shown in FIG. 9 and FIG. 10, the lens holding portion 260 of the imaging lens 25 is held in the upper portion of the outer peripheral surface (outer surface) 261 which is circular in cross section when viewed from the surface passing through the optical axis L (L2). It is formed in such a manner as to provide a recess 262 extending in the optical axis direction. Further, a flange portion 263 for use in sliding adjustment is provided on the reading port 13 side of the lens holding portion 160.

Further, the holder 250 of the fixed area sensor 23 omits the opening 55 and the like with respect to the above-described holder 50, and forms an opening 252 which is slidably attached to the outer peripheral surface 261 of the lens holding portion 260 at the end portion 251, at the opening 252 The upper portion forms a convex portion 253 that is slidably attached to at least a part of the upper surface and the side surface of the concave portion 262 of the lens holding portion 260.

In the present embodiment, the first reference surface and the second reference surface are formed by the outer peripheral surface 261 of the lens holding portion 260 and the concave portion 262 provided on the outer peripheral surface 261, and the first guide surface and the second guide. The lead surface is formed by the edge surface of the opening 252 provided in the holder 250 and the convex portion 253 provided in the opening 252.

Even in such a configuration, when the relative position of the area sensor 23 and the imaging lens 25 is adjusted, the outer peripheral surface 261 and the concave portion 262 can be slidably attached to the opening 252 and the convex portion 253, respectively, so that the lens holding portion 260 is opposed to each other. The holder 250 is moved along the optical axis L. Therefore, since the single bokeh portion S does not rotate when the relative position of the area sensor 23 and the imaging lens 25 is changed and the optimum focus position is obtained, the influence of the single bokeh can be suppressed with respect to the change in the measured resolution.

In addition, the lens holding portion 260 is formed so as to be slidably attached to the opening 252 of the holder 250 at the lower portion of the outer peripheral surface 261, and the bottom surface and the side surface of the recessed portion 262 may be configured to function as the first reference surface and the second reference surface.

[Fourth embodiment] Next, an optical information reading device according to a fourth embodiment will be described with reference to Figs. 11 and 12 . In the fourth embodiment, the bracket 350 and the lens holding portion 360 are mainly used in place of the above-described bracket 50 and lens holding portion 60, which is different from the above-described first embodiment.

Specifically, as shown in FIG. 11 and FIG. 12, the lens holding portion 360 of the imaging lens 25 is held to form the upper surface 361 and the lower surface 362 thereof so as to have a square shape in cross section when viewed from the surface passing through the optical axis L (L2). Both sides 363, 364.

Further, the holder 350 of the fixed area sensor 23 is omitted from the above-described holder 50, and the end portion 351 is formed to be slidably attached to the upper surface 361, the lower surface 362 of the lens holding portion 360, and the both side surfaces 363, 364. A square-shaped opening 352.

In other words, in the present embodiment, the first reference surface and the second reference surface are formed by the upper surface 361, the lower surface 362, and the two side surfaces 363 and 364 of the lens holding portion 360, and the first guiding surface and the second guiding surface. It is formed by the edge surface of the opening 352 provided in the holder 350.

Even in such a configuration, when the relative position of the area sensor 23 and the imaging lens 25 is adjusted, the upper surface 361, the lower surface 362, and the both side surfaces 363, 364 can be slidably attached to the opening 352, respectively, so that the lens holding portion 360 is slidably attached to the opening 352, respectively. Moving relative to the bracket 350 along the optical axis L. Therefore, since the single bokeh portion S does not rotate when the relative position of the area sensor 23 and the imaging lens 25 is changed and the optimum focus position is obtained, the influence of the single bokeh can be suppressed with respect to the change in the measured resolution.

Further, the upper surface 361, the lower surface 362, and the both side surfaces 363 and 364 of the lens holding portion 360 are not limited to being formed in a square shape in cross section when viewed from the surface passing through the optical axis L, and for example, include a rectangular shape and a cross section. The shape of the pentagon or the like may be formed so as to have a polygonal shape in cross section.

[Fifth Embodiment] Next, an optical information reading apparatus according to a fifth embodiment will be described with reference to Figs. 13 and 14 . In the fifth embodiment, the bracket 450 and the lens holding portion 460 are mainly used in place of the above-described bracket 50 and lens holding portion 60, which is different from the above-described first embodiment.

Specifically, as shown in FIG. 13 and FIG. 14 , the lens holding portion 460 of the imaging lens 25 is held in a cross-sectional arc shape (cross-sectional arc shape) when viewed from the surface passing through the optical axis L (L2). The upper surface of the outer peripheral surface 461 is formed by providing a flat surface 462. Further, a flange portion 463 for use in sliding adjustment is provided on the reading port 13 side of the lens holding portion 460.

Further, the bracket 450 of the fixed area sensor 23 omits the opening 55 and the like with respect to the above-described bracket 50, and the outer peripheral surface 461 and the plane 462 of the end portion 451 with respect to the lens holding portion 460 are at the rim surface 452a and the rim surface 452b. The way of sliding forms an opening 452.

In other words, in the present embodiment, the first reference surface and the second reference surface are formed by the outer circumferential surface 461 of the lens holding portion 460 and the flat surface 462, and the first guiding surface and the second guiding surface are provided on the bracket. The edge surface 452a of the opening 452 of 450 and the edge surface 452b are formed.

Even in such a configuration, when the relative position of the area sensor 23 and the imaging lens 25 is adjusted, the outer peripheral surface 461 and the flat surface 462 can be slidably attached to the edge surfaces 452a and 452b of the opening 452, respectively. 460 moves relative to the bracket 450 along the optical axis L. Therefore, since the single bokeh portion S does not rotate when the relative position of the area sensor 23 and the imaging lens 25 is changed and the optimum focus position is obtained, the influence of the single bokeh can be suppressed with respect to the change in the measured resolution.

[Sixth embodiment] Next, a method of manufacturing an optical information reading device according to a sixth embodiment will be described with reference to the drawings. In the sixth embodiment, in the assembly process of the lens holding portion 60 and the holder 50 constituting the optical information reading device 10, the lens holding portion 60 is mainly provided in order to reliably perform the adjustment operation to the optimum focus position. The case where the holder 50 is gradually slid and the resolution is measured sequentially, and the arm for fixing and the X stage are used is different from the above-described first embodiment.

As shown in FIG. 15 and FIG. 16 , in the method of manufacturing the optical information reading apparatus 10 of the present embodiment, a holder 50 mounting table 501 having a lens holding portion 60 before mounting and fixing the bonding is mainly used. The arm 510 and the X stage 520 that move (slide) the lens holding portion 60 placed on the mounting table 501 with respect to the holder 50, and the manufacturing apparatus 500 that drives the control unit 530 that controls the X stage 520. Next, the arm 510 is moved in the direction of the optical axis L1 while the resolution of the area sensor 23 is sequentially measured, and the measured resolution is regarded as the peak position of the peak to fix the lens holding portion 60 to the holder 50. The way to adjust the focus position adjustment work.

The mounting table 501 is configured such that the image sensor signal from the area sensor 23 of the holder 50 can be output to the control unit 530 by placing the holder 50 at a predetermined position.

The arm 510 is provided with a pair of engagement projections 513 that are respectively engaged with the two engagement portions 64 of the lens holding portion 60 on the lower surface of the one end side 511, and the other end side 512 is detachably attached to the X stage 520. The engaging projections 513 are formed without gaps between the engaged engaging portions 64 in at least the direction along the optical axis L1 (X direction). One end side 511 of the arm 510 is formed such that the two engaging projections 513 are respectively engaged with the corresponding engaging portions 64 so that the two bonding grooves 65 are exposed.

The X stage 520 is a device for moving the arm 510 in which the other end side 512 is assembled in the direction of the optical axis L1, and the moving direction or the amount of movement is configured to be driven and controlled by the control unit 530.

The control unit 530 performs the focus position adjustment processing, and the relative position of the area sensor 23 fixed to the holder 50 and the imaging lens 25 held by the lens holding unit 60 becomes the reaction force of the area sensor 23 to be measured. The optimum focus position is driven to control the X stage 520. The control unit 530 may be configured as a control board including a CPU and a memory, and may be configured by an application installed in a predetermined terminal.

Next, the manufacturing process when the lens holding portion 60 and the holder 50 of the temporary group are bonded and fixed such that the relative position of the area sensor 23 and the imaging lens 25 becomes the optimum focus position will be specifically described.

First, the lens holding portion 60 holding the imaging lens 25 is temporarily set with respect to the holder 50 of the fixed area sensor 23 so that the lower surface 63 and the end surfaces 61a and 61b face the upper surface 54 and the edge surfaces 56a and 56b, respectively. Next, the bracket 50 temporarily placed in this manner is placed at a predetermined position of the mounting table 501. Thereby, the image signal from the area sensor 23 is output to the control unit 530.

Next, the engaging projections 513 are respectively engaged with the engaging portions 64, and the arms 510 assembled to the X stage 520 are assembled to the lens holding portion 60. Further, as shown in FIGS. 15 and 16, the pattern M illustrated in FIG. 17(A) or FIG. 17(B) is placed at a focus position to be adjusted in the imaging field of view of the area sensor 23.

In this state, the focus position adjustment processing of the control unit 530 is started. Specifically, as illustrated in FIG. 18(A), each time the drive control X stage 520 moves the arm 510 in accordance with a predetermined amount of movement in one direction along the optical axis, the region based on the imaging pattern M will be derived. The contrast value obtained by the output of the sensor 23 is measured as the resolution. In the case where the amount of movement is shorter than the predetermined value N1 set so as to be lower than the intended peak value, the predetermined amount of movement is equal to or greater than the predetermined value N1. The movement amount X2 is smaller than the movement amount X1 when the comparison value of the predetermined value N1 is not exceeded.

Then, when the contrast value measured while moving the arm 510 in the above-described one direction exceeds the peak value and starts to fall below the threshold value N2 set based on the maximum contrast value Po measured before, the arm 510 caused by the X stage 520 is caused. The movement stops. Next, as illustrated in Fig. 18(B), the arm 510 is moved in the other direction along the optical axis L1 which is the reverse direction with respect to the one direction described above, and the contrast value is sequentially measured. Further, in the present embodiment, the movement amount X3 when moving in the other direction is set to be smaller than the movement amount X2. For example, when the movement amount X3 when moving in the other direction is set to one step, the movement amount X2 can be set to five steps, and the movement amount X1 can be set to ten steps.

Then, when the peak value of the arm 510 is measured while moving in the other direction, the maximum contrast value measured before and the position of the lens holding unit 60 for measuring the contrast value are set as the peak value Pa and the peak position Px. . Then, when the contrast value measured while moving in the other direction is equal to or smaller than the threshold value N3 set based on the peak value Pa, the movement of the arm 510 by the X stage 520 is stopped.

Then, after the lens holding portion 60 is moved beyond the peak position Px, the arm 510 is moved in one direction along the optical axis L1 (see an arrow F1 in FIG. 18(B)), and the arm 510 is again turned to the other position toward the peak position Px. The direction movement (refer to arrow F2 of FIG. 18(B)) stops the movement of the arm 510 by the X stage 520 at the peak position Px. Further, the other direction along the optical axis L1 may correspond to an example of the "first direction", and one direction along the optical axis L1 may correspond to an example of the "second direction".

After the lens holding portion 60 is moved at the peak position Px in this manner, as shown in FIG. 19, the dispenser for the UV adhesive is used to apply UV bonding from the bonding groove 65 to the bonding groove 53a. Agent. By fixing the UV adhesive by UV rays or the like in this state, the lens holding portion 60 is fixed to the holder 50 in a state in which the arm 510 is assembled. The arm 510 can also be detached from the X stage 520 during this fixation.

After the lens holding portion 60 is fixed to the holder 50 in this manner, the arm 510 is detached from the lens holding portion 60, and the light receiving optical system in which the lens holding portion 60 is fixed at the peak position Px with respect to the holder 50 is completed.

As described above, in the method of manufacturing the optical information reading apparatus 10 of the present embodiment, the lens holding portion 60 that holds the imaging lens 25 is placed on the lower surface 63 and the end surfaces 61a and 61b with respect to the holder 50 to which the area sensor 23 is fixed. Assembled so as to face the upper surface 54 and the rim surfaces 56a and 56b, the arm 510 movable along the optical axis L1 is assembled to the lens holding portion 60, and the lower surface 63 and the end surfaces 61a, 61b are slidably coupled to the upper surface 54 and the rim surface 56a. The manner of 56b causes the arm 510 to move in the direction along the optical axis L1 while sequentially measuring the resolution (comparison value) of the area sensor 23, and the measured resolution is at the peak position Px regarded as the peak. After the lens holding portion 60 in the state in which the arm 510 is assembled is bonded and fixed to the holder 50, the arm 510 is detached from the lens holding portion 60.

Therefore, when the lens holding portion 60 is fixed to the holder 50 at the peak position Px, since the arm 510 is assembled in the lens holding portion 60, the lens holding portion 60 is less likely to be displaced from the peak position Px, and can be reliably performed. The adjustment of the optimum focus position obtained by the analysis force is measured.

In particular, in the process of fixing the lens holding portion 60 to the holder 50, the arm position 510 is obtained by moving the arm 510 in the other direction (first direction) along the optical axis L1 to exceed the peak position Px. By moving the arm in one direction along the optical axis L1 (the second direction: see the arrow F1 in FIG. 18(B)), the arm 510 is placed in the other direction toward the peak position Px (first direction: reference drawing) The arrow F2) of 18(B) moves, and the lens holding portion 60 is fixed to the holder 50 at the peak position Px.

When the moving direction of the arm is switched from the first direction to the second direction, there is a gap or the like of the X stage 520 acting as an actuator for moving the arm 510, and even the X holding stage 520 lens holding portion 60 is driven. In the case where it is not moved, in the case where the lens holding portion 60 is moved in the other direction toward the peak position Px which is moved while being moved in the first direction, it is fixed to the position deviated from the peak position Px. The possibility. Here, when the peak position Px is obtained while moving in the first direction, the arm 510 is moved in the second direction along the optical axis L1 so as to exceed the peak position Px, and then the arm 510 is moved toward the peak position Px. When the first direction is moved, the lens holding portion 60 is fixed to the holder 50 at the peak position Px, whereby the occurrence of the above-described variation from the peak position Px can be prevented, and the adjustment to the optimum focus position can be performed more surely.

In the process of sequentially measuring the resolution (contrast value), the amount of movement when the analysis force of the predetermined value N1 or more is measured is equal to the amount of movement of the predetermined value N1 as compared with the movement amount X2 and X3. The amount of movement X1 is still small. As a result, the measurement measurement time until the vicinity of the peak position Px is shortened, and the measurement measurement accuracy in the vicinity of the peak position Px is improved, and both the measurement time reduction and the measurement accuracy can be improved.

Further, the method of manufacturing the light receiving optical system using the above-described arm 510 or the like can be applied to other embodiments.

In addition, the present invention is not limited to the above-described respective embodiments and modifications, and may be embodied in the following manner, for example.

(1) In the lens holding portions 160, 260, 360, and 460 of the second to fifth embodiments, the adjustment to the optimum focus position is performed as the pair of engaging portions 64 of the lens holding portion 60 are formed. It can also be used for the engaging portion at the time of sliding adjustment.

(2) The present invention is not limited to an optical information reading device that is adapted to optically read an information code, and an optical information reading device that optically reads text information or the like by using a well-known symbol recognition processing function (OCR) It is applicable to other functions than optical reading functions such as information codes. For example, an information reading device such as a wireless communication medium and a wireless communication device capable of wireless communication can be applied.

[Seventh embodiment] Hereinafter, an optical information reading apparatus according to a seventh embodiment of the present invention will be described with reference to the drawings. The optical information reading device 610 shown in FIG. 20 to FIG. 23 is configured as a reader that optically reads one or two or more pieces of information codes (one-dimensional code and two-dimensional code) to form a so-called gun. In the appearance of the profile, the circuit portion 20 composed of various electronic components or the like is housed in a case 611 made of a synthetic resin such as ABS resin.

As shown in FIGS. 20 to 22, the optical information reading device 610 includes a main body portion 612 in which a reading port 613 for passing illumination light and reflected light is formed at an end portion, and the main body portion 612 is coupled and formed. The grip portion 615 gripped by the user is a portion where the portion of the port 613 is different. As shown in FIG. 22, the reading port 613 is formed in a slightly rectangular shape so that the length in the left-right direction is shorter than the length in the vertical direction. An extension portion 614 is provided at a lower portion of the reading port 613 in the main body portion 612. The extension portion 614 allows the extension end portion 614a to view information from above even if it is in contact with a reading object with an information code attached thereto. The code and the method of marking light to be described later are formed in a slightly U-shaped manner in the upper opening. The grip portion 615 extends downward from the lower wall portion of the main body portion 12, and a trigger switch 642 that can be pressed is disposed in the vicinity of the upper end portion of the grip portion 615, and a cable for assembling the interface is provided in the vicinity of the lower end portion of the grip portion 615 (illustration Slightly) the construction.

Next, an electrical configuration of the optical information reading device 10 will be described with reference to FIG. Each element of the electrical configuration can perform almost the same function as each element in the electrical configuration shown in FIG. 2, but since different reference symbols are used, the description will be repeated. As shown in FIG. 23, the circuit unit 620 housed in the case 611 mainly includes an optical system such as a first light source 621, a second light source 622, a region sensor 623, and an imaging lens 625, a memory 635, a control unit 640, and the like. Microcomputer (hereinafter referred to as "microcomputer") system.

The optical system is divided into a light projecting optical system and a light receiving optical system. The light projecting optical system includes a first light source 621 and a second light source 622 as a pair of light sources. The first light source 621 includes an LED 621a that emits visible light Lf1 having a wavelength of, for example, 380 nm to 750 nm, and an illumination lens provided on the emission side of the LED 621a. Further, the second light source 622 includes an LED 622a that emits invisible light Lf2 that cannot be recognized such as infrared light having a wavelength of 750 nm or more, and an illumination lens that is provided on the emission side of the LED 622a.

The light receiving optical system is composed of a region sensor 623, an imaging lens 25, and the like. The area sensor 623 is a light-receiving sensor having a rectangular light-receiving surface 623a in which a light-receiving element such as a solid-state imaging device such as a C-MOS or a CCD is arranged two-dimensionally, and is configured to be capable of imaging the information code C. And outputting an electrical signal in response to the intensity of the reflected light Lr in each unit (pattern) of the received information code. The area sensor 623 is mounted on the sensor substrate 651 in such a manner as to receive incident light incident through the imaging lens 625.

The imaging lens 625 is configured to have one or two or more lenses, and functions as an imaging optical system that collects incident light incident from the outside through the reading port 613 and can image the light receiving surface 623a of the area sensor 623. In the present embodiment, the information code C and the reflected light Lr from the predetermined display surface R with the information code C are collected by the imaging lens 625, and the code image is imaged by the light receiving surface 623a of the area sensor 623. The detailed arrangement of the optical system configured as described above will be described later.

The microcomputer system includes an amplification circuit 631, an A/D conversion circuit 633, a memory 635, an address generation circuit 636, a synchronization signal generation circuit 638, a control unit 640, a trigger switch 642, a light-emitting portion 643, a buzzer 644, a vibrator 645, And a communication interface 648 and the like.

The image signal (analog signal) output from the area sensor 623 of the optical system is input to the amplification circuit 631 and amplified with a predetermined gain, and then input to the A/D conversion circuit 633 to be converted from the analog signal to the digital signal. Then, the digitized video signal, that is, the video data (video information) is input to the memory 635 composed of a known memory medium such as a ROM or a RAM, and is accumulated in a predetermined storage area. Further, the synchronizing signal generating circuit 638 is constructed in such a manner as to generate a synchronizing signal to the area sensor 623 and the address generating circuit 636, and the address generating circuit 636 is based on the synchronizing signal supplied from the synchronizing signal generating circuit 638. The storage address of the image data stored in the memory 635 is generated.

The control unit 640 is configured by a CPU, a system bus, an input/output interface, and the like, and can form an information processing device together with the memory 635 to have an information processing function. The control unit 640 functions to perform interpretation processing (decoding) on the code image of the information code recorded by the area sensor 623 and memorized in the memory 635. Further, the control unit 640 is configured to be connectable to various input/output devices (peripheral devices) via the built-in input/output interface, and in the case of the present embodiment, the trigger switch 642, the light-emitting unit 643, the buzzer 644, and the vibration are connected. The device 645, the communication interface 648, and the like. Thereby, for example, monitoring or management of the trigger switch 642, lighting of the light-emitting unit 643, non-lighting, opening and closing of the buzzer 644 capable of generating a click or warning sound, and driving of the vibrator 45 can be performed. Control, control of communication interface 648, and the like.

Next, a detailed arrangement configuration and the like of the optical system as described above will be described in detail with reference to Figs. 24 to 28 . In addition, the short side direction of the light receiving surface 623a is set to the X direction, the long side direction of the light receiving surface 623a is set to the Y direction, and the direction perpendicular to both the X direction and the Y direction (the direction of the light receiving axis) is set to the Z direction. The following instructions.

In the optical system of the present embodiment, the sensor substrate 651 in which the area sensor 623 is mounted or the first illumination board 652 on which the LED 621a is mounted, and the second illumination board on which the LED 622a is mounted is fixed at a predetermined position of the holder 650. 653 and so on. Thereby, the first light source 621 and the second light source 622, the area sensor 623, and the imaging lens 25 are disposed in the positional relationship shown in FIGS. 24 and 25.

More specifically, as shown in FIG. 25, the first light source 621 and the second light source 622 are arranged in a row along the short-side direction (X direction) of the light-receiving surface 623a, and are equally spaced from the first light source 621 and the second light source 622. The imaging lens 25 is disposed at a position, whereby the light receiving optical axis L of the area sensor 623 is positioned between the first light source 621 and the second light source 622. Therefore, the light receiving optical axis L and the light projecting optical axis L1 of the first light source 621 and the light projecting optical axis L2 of the second light source 622 are aligned in the short side direction of the light receiving surface 623a. In other words, the first light source 621 and the second light source 622 are disposed such that the distance from the LED 621a to the light receiving axis L is equal to the distance from the LED 622a to the light receiving axis L.

The holder 650 such as the sensor substrate 651 and the first illuminating board 652 and the second illuminating board 653 is fixed in the above-described positional relationship, and the longitudinal direction (Y direction) of the light receiving surface 623a and the horizontal direction of the reading port 613 are The housing 611 is housed in a slightly parallel manner. In this way, the imaging field of view AR of the area sensor 623 having a rectangular shape in accordance with the shape of the light receiving surface 623a is the same as the reading port 613, and the horizontal direction is the longitudinal direction, and the irradiation range of the visible light Lf1 and the irradiation range of the invisible light Lf2 are The center position is slightly uniform in the left-right direction and becomes difficult to deviate, and the up-and-down direction is in a state of being deviated.

Generally, when reading an information code elongated in one direction such as a barcode, the long-side direction of the information code is consistent with the long-side direction of the imaging field of view AR, that is, the long-side direction of the reading port 613. The state in which the reading port 613 faces the information code. Therefore, unlike the present embodiment, when the two irradiation ranges are shifted in the longitudinal direction of the imaging field of view AR, for example, the invisible light Lf2 is irradiated to one side in the longitudinal direction of the barcode but not to the long side. Side, and there is a case where the reading fails.

With regard to this problem, in the present embodiment, since the irradiation range of the visible light Lf1 and the irradiation range of the invisible light Lf2 are not shifted in the longitudinal direction of the imaging field of view AR with respect to the information code C, it is possible to suppress the imaging field of view AR due to the two irradiation ranges. The above-mentioned read failure or the like caused by the shift of the long side direction.

In particular, in the present embodiment, the first light source 621 and the second light source 622 are disposed such that the irradiation range of the first light source 621 is lower than the irradiation range of the second light source 622 when viewed by the user. In other words, the holder 50 is housed in the case 11 such that the first light source 621 is positioned lower than the second light source 622.

The reason why the first light source 621 is located below the second light source 622 as described above will be described with reference to FIGS. 26 to 28 . Normally, when the reading port 613 is directed to the information code C displayed on the predetermined display surface R by a label or the like, the user observes the information code C through the reading port 613 while performing the reading operation. Therefore, for example, as shown in FIG. 26(A), a case where the information code C of the predetermined display surface R of the hand-held label or the like is read and a predetermined display of the label or the like on the table are read as shown in FIG. 26(B) In the case of the information code C of the surface R, the predetermined display surface R is likely to be relatively inclined so as to be away from the reading port 613 with respect to the upper side of the light receiving optical axis L.

In this state, the imaging field of view AR becomes the upper side with respect to the light receiving optical axis L because the folded-back field of view AR1 passing through the predetermined display surface R is as shown in FIG. 27(B), and the irradiation light intensity is greater than the invisible light Lf2. When the first light source 21 of the strong visible light Lf1 is positioned above the light receiving optical axis L, the first light source 621 easily enters the folded-back field of view AR1. In other words, since the visible light Lf1 reflected on the predetermined display surface R is easily reflected, as shown in FIG. 28(B), the visible light Lf1 is reflected on the imaged information code C, and the reading performance is lowered. possibility.

Here, the first light source 621 is positioned below the light receiving optical axis L, and the first light source is disposed such that the irradiation range of the first light source 621 is lower than the irradiation range of the second light source 622 when viewed by the user. 621 and the second light source 622 (see FIG. 25). As a result, as shown in FIG. 27(A), the first light source 621 hardly enters the folded-back view AR1 passing through the predetermined display surface R, and as shown in FIG. 28(A), the visible light Lf1 does not reflect the imaged image. In the information code C, it is possible to suppress a decrease in the reading performance caused by the reflection of the visible light Lf1 having a strong light intensity.

As described above, the optical information reading device 610 of the present embodiment is provided with an area sensor 623 that receives reflected light from the information code C on the rectangular light receiving surface 623a, and faces the area sensor. In the imaging field of view 623, the visible light Lf1 is the first light source 621 for illuminating light and the second light source 622 for illuminating the invisible light Lf2, and the first light source 621 and the second light source 622 are arranged along the short side direction (X direction) of the light receiving surface 623a. In a column.

With this, the irradiation range of the visible light Lf1 and the irradiation range of the invisible light Lf2 are hardly shifted with respect to the longitudinal direction of the imaging field of view AR with respect to the imaging field of view AR in which the shape of the light receiving surface 623a is rectangular, and it is possible to suppress the two irradiations. The reading failure due to the shift in the longitudinal direction of the imaging field of view AR is unsuccessful. Therefore, even when both the first light source 621 that emits the visible light Lf1 and the second light source 622 that emits the invisible light Lf2 are mounted, it is possible to suppress a decrease in read performance due to variations in the two irradiation ranges.

In addition, the first light source 621 and the second light source 622 are disposed such that the light receiving optical axis L of the area sensor 623 is located between the first light source 621 and the second light source 622. Thereby, the center of the imaging field of view AR and the center of the irradiation range of the visible light Lf1 and the center of the irradiation range of the invisible light Lf2 are close to each other in the short-side direction of the imaging field of view AR, and the imaging field of view AR and the two irradiation ranges can be made. The offset between them is further reduced, which improves read performance.

In particular, the first light source 621 and the second light source 622 are disposed such that the irradiation range of the first light source 621 is lower than the irradiation range of the second light source 622 when viewed by the user. As a result, it is possible to prevent the first light source 21 from entering the folded-back view field AR1 passing through the predetermined display surface R, and it is possible to suppress a decrease in the reading performance due to the reflection of the visible light Lf1 having a strong light intensity.

[Eighth Embodiment] Next, an optical information reading apparatus according to an eighth embodiment will be described with reference to Figs. 29 and 30 . In the eighth embodiment, the first light source 621 and the second light source 622 are mainly mounted on the same substrate, which is different from the seventh embodiment.

Specifically, as shown in FIGS. 29 and 30, by mounting the LED 621a and the LED 622a on the illumination board 654, the first light source 621 and the second light source 622 are along the short side direction (X direction) of the light receiving surface 623a. In a row, the imaging lens 625 is shifted from the longitudinal direction (Y direction) of the light receiving surface 623a and is adjacent to each other, and the distance from the LED 621a to the light receiving axis L is equal to the distance from the LED 622a to the light receiving axis L. . In particular, in the present embodiment, the first light source 621 and the second light source 622 are arranged in close proximity, and the illumination lens 627 integrally formed by the illumination lens of the first light source 621 and the illumination lens of the second light source 622 is used. In addition, in FIGS. 29 and 30, the approximate position of the illumination lens 627 is shown by a broken line.

With this configuration, the first light source 621 and the second light source 622 are disposed so as to be offset from the longitudinal direction of the light receiving surface 623a with respect to the imaging lens 625, and the first light source is larger than that of the seventh embodiment. The 621 and the second light source 622 are arranged close to each other in the short-side direction of the light-receiving surface 623a, and are less likely to interfere with the imaging lens 625. As a result, the space of the holder 650 in which the first light source 621 and the second light source 622 are arranged in close proximity can be reduced, and the optical information reading device 610 can be downsized.

Further, since the first light source 621 and the second light source 622 are mounted on the same illuminating substrate 654, the first light source 621 and the second light source 621 can be easily prevented from being displaced, and the first light source 621 and the second light source 621 can be easily removed. The light source 622 is compactly arranged to achieve miniaturization of the optical information reading device 610.

Further, since the illumination lens for the first light source 621 and the illumination lens for the second light source 622 are integrally formed as the illumination lens 627, the number of components of the illumination lens can be reduced, and the first light source 621 can be easily formed. The second light source 622 is compactly arranged to reduce the size of the optical information reading device 610.

In addition, the configuration in which the first light source 621 and the second light source 622 are mounted on the same substrate or the configuration in which the illumination lenses for the first light source 621 and the second light source 622 are integrally molded can be applied to other embodiments and the like.

In addition, the present invention is not limited to the above-described respective embodiments and modifications, and may be embodied in the following manner, for example.

(1) As shown in FIG. 25 or FIG. 30, the first light source 621 is not limited to being disposed below the second light source 622, and for example, the folded-back field of view AR1 passing through the predetermined display surface R with respect to the light receiving optical axis L In the reading operation environment or the like that is likely to be the lower side, the first light source 621 may be disposed on the upper side than the second light source 622.

(2) When the first light source 621 and the second light source 622 are arranged in a line along the short-side direction (X direction) of the light-receiving surface 623a, the distance from the LED 621a to the light-receiving optical axis L and the distance from the LED 622a are not limited to the above. The distance from the light-optic axis L is equal, and the distance from the LED 621a to the light-receiving optical axis L may be longer than the distance from the LED 622a to the light-receiving optical axis L. Conversely, the LED 622a to the light-receiving optical axis L may be arranged. The distance may be longer than the distance from the LED 621a to the light receiving axis L.

(3) The present invention is not limited to an optical information reading device having a gun-type appearance, and can be applied to an optical information reading device having various appearances, and for example, can also be applied to an optical information reading having a slightly box-like appearance. Take the device. Further, the present invention is not limited to an optical information reading device that is suitable for optical reading of an information code, and an optical information reading device that optically reads character information or the like by using a well-known symbol recognition processing function (OCR) is also applicable. In addition to other functions such as an optical reading function such as an information code, for example, an information reading device such as a wireless communication medium and a wireless communication device capable of wireless communication can be applied.

10‧‧‧ Optical information reading device

23‧‧‧ Area Sensor

23a‧‧‧Glossy surface

25‧‧‧ imaging lens

50, 150, 250, 350, 450‧‧‧ brackets

53‧‧‧Edge

54‧‧‧Top (guide surface, first guide surface)

55‧‧‧ openings

56a, 56b‧‧‧ edge (guide surface, second guide surface)

60, 160, 260, 360, 460‧ ‧ lens holding department

61‧‧‧ Keeping the body

61a, 61b‧‧‧ end faces (reference plane, second datum)

62‧‧‧Flange

63‧‧‧Flange below (reference surface, first reference surface)

500‧‧‧ manufacturing equipment

510‧‧‧arm

520‧‧‧X stage

530‧‧‧Control Department

L, L1, L2‧‧‧ optical axis

S‧‧‧Single bokeh section

610‧‧‧ Optical information reading device

621‧‧‧first light source

622‧‧‧2nd light source

623‧‧‧Area sensor

623a‧‧‧Glossy

625‧‧‧ imaging lens

AR‧‧‧Video field of view

AR1‧‧‧Returned to the field of vision

C‧‧‧Information Code

Lf1‧‧‧ visible light

Lf2‧‧‧Invisible light

R‧‧‧Predetermined display surface

In the drawings: [Fig. 1] A block diagram schematically showing a configuration of an optical information reading apparatus according to a first embodiment. Fig. 2 is a view showing a configuration of a holder in the first embodiment, Fig. 2(A) is a front view, Fig. 2(B) is a plan view, and Fig. 2(C) is a side view. Fig. 3 is a view showing a configuration of a lens holding portion in the first embodiment, Fig. 3(A) is a front view, Fig. 3(B) is a plan view, and Fig. 3(C) is a side view. Fig. 4 is a view showing a state in which the lens holding portion is assembled to the holder in the first embodiment, wherein Fig. 4(A) is a front view, Fig. 4(B) is a plan view, and Fig. 4(C) is a partial cross-sectional view. Side view. Fig. 5 is an explanatory view for explaining a position of a single bokeh portion with respect to an imaging field of view when the imaging lens of the present invention is relatively moved to the area sensor. [Fig. 6] An explanatory diagram for explaining a position of a single bokeh portion with respect to an imaging field of view when the imaging lens of the prior art is relatively moved to the area sensor. Fig. 7 is a view showing a configuration of a stent in a second embodiment, Fig. 7(A) is a front view, Fig. 7(B) is a plan view, and Fig. 7(C) is a side view. Fig. 8 is a view showing a state in which the lens holding portion is assembled to the holder in the second embodiment, Fig. 8(A) is a front view, Fig. 8(B) is a plan view, and Fig. 8(C) is a side view. Fig. 9 is a view showing a configuration of a stent in a third embodiment, wherein Fig. 9(A) is a front view, Fig. 9(B) is a plan view, and Fig. 9(C) is a side view. Fig. 10 is a view showing a state in which the lens holding portion is assembled to the holder in the third embodiment, and Fig. 10(A) is a front view, Fig. 10(B) is a plan view, and Fig. 10(C) is a side view. Fig. 11 is a view showing a configuration of a stent in a fourth embodiment, wherein Fig. 11(A) is a front view, Fig. 11(B) is a plan view, and Fig. 11(C) is a side view. Fig. 12 is a view showing a state in which the lens holding portion is assembled to the holder in the fourth embodiment, and Fig. 12(A) is a front view, Fig. 12(B) is a plan view, and Fig. 12(C) is a side view. Fig. 13 is a view showing a configuration of a stent in a fifth embodiment, wherein Fig. 13(A) is a front view, Fig. 13(B) is a plan view, and Fig. 13(C) is a side view. Fig. 14 is a view showing a state in which the lens holding portion is assembled to the holder in the fifth embodiment, Fig. 14(A) is a front view, Fig. 14(B) is a plan view, and Fig. 14(C) is a side view. [Fig. 15] A plan view schematically showing a manufacturing apparatus used in a method of manufacturing an optical information reading apparatus according to a sixth embodiment. [Fig. 16] A side view schematically showing a manufacturing apparatus used in a method of manufacturing an optical information reading device according to a sixth embodiment. [Fig. 17] Fig. 17(A) is an explanatory diagram showing an example of a pattern for measuring a contrast value, and Fig. 17(B) is an explanatory diagram showing another example of a pattern for measuring a contrast value. 18(A) is an explanatory view showing a measurement result of a contrast value when the arm is moved in one direction, and FIG. 18(B) is a measurement result showing a comparison value when the arm is moved in the other direction. Illustrating. FIG. 19 is an explanatory view showing a state in which a UV adhesive is applied to a lens holding portion that moves at a peak position and a holder for a bonding groove. Fig. 20 is a perspective view showing an optical information reading apparatus according to a seventh embodiment. Fig. 21 is a right side view of the optical information reading device of Fig. 20. Fig. 22 is a front elevational view of the optical information reading device of Fig. 20. Fig. 23 is a block diagram schematically showing an electrical configuration of the optical information reading device of Fig. 20; [Fig. 24] An explanatory view of the positional relationship between the first light source and the area sensor viewed from the first light source side in the direction perpendicular to the light receiving axis in the seventh embodiment. [Fig. 25] An explanatory diagram for explaining the positional relationship between the two light sources and the area sensor as viewed from the reading port side in the seventh embodiment. [Fig. 26] is an explanatory diagram for explaining an angle between an information code of a predetermined display surface and an optical information reading device at the time of reading a job, and Fig. 26(A) shows an information code of a predetermined display surface for reading a hand-held tag or the like. In the case of Fig. 26(B), the case where the information code C of the predetermined display surface of the label or the like on the table is read is shown. FIG. 27 is an explanatory view for explaining a relationship between a folded-back field of view of a predetermined display surface and a light receiving axis, and FIG. 27(A) shows a state in which the first light source is positioned below the light receiving optical axis, and FIG. 27(B) shows the first A state in which the light source is located on the upper side with respect to the light receiving optical axis. 28(A) is an explanatory diagram for explaining an imaging state of the imaging information code in the state of FIG. 27(A), and FIG. 28(B) is an imaging state for explaining the imaging information code of the state of FIG. 27(B). Illustration of the diagram. [Fig. 29] An explanatory view of the positional relationship between the first light source and the area sensor viewed from the first light source side in the direction perpendicular to the light receiving axis in the eighth embodiment. [Fig. 30] An explanatory diagram for explaining the positional relationship between the two light sources and the area sensor as viewed from the reading port side in the eighth embodiment.

Claims (19)

An optical information reading device, comprising: an area sensor for receiving reflected light from an information code through an imaging lens, and optically reading the information code based on a signal output by the area sensor, wherein the optical information reading device a holder for fixing the area sensor; a lens holding portion that is assembled to the holder in a state of holding the imaging lens and provided with a reference surface along an optical axis of the imaging lens; and a guide surface formed on the holder The guide surface is in contact with the reference surface when the lens holding portion is assembled such that the light passing through the imaging lens is formed on the area sensor, and the lens holding portion is moved along the optical axis. Slide the aforementioned reference plane. The optical information reading device according to claim 1, wherein the area sensor has a rectangular light receiving surface; and in each of the imaging lenses, grasping a portion of a field of view that passes through the imaging lens causes a performance degradation. The position of the single bokeh; the lens holding portion holds the imaging lens such that a portion where the field of view of the single bokeh is generated is located outside the light receiving surface on the long side of the light receiving surface. The optical information reading device according to claim 1 or 2, wherein the reference plane is composed of a planar first reference surface and a planar second reference surface that intersects the first reference surface; The surface is composed of a planar first guide surface that is slidable to the first reference surface and a planar second guide surface that is slidable to the second reference surface. The optical information reading device according to claim 3, wherein the lens holding portion has a flange portion, and the flange portion functions as at least a part of a plane on the imaging lens side as the first reference surface; At the time of the assembly, a portion of the lens holding portion that is closer to the imaging lens side than the flange portion is formed by the opening, and at least a part of the plane on which the opening is provided functions as the first guiding surface. The optical information reading device according to claim 4, wherein the flange portion is formed to cover the opening on a plane that is on the side of the imaging lens at the time of the sliding. The optical information reading device according to claim 3, wherein the first reference surface and the second reference surface are formed by a convex portion provided on an outer surface of the lens holding portion; the first guiding surface and the second guiding surface The lead surface is formed by a recess provided in the aforementioned bracket. The optical information reading device according to claim 3, wherein the first reference surface and the second reference surface are formed by a concave portion provided on an outer surface of the lens holding portion; the first guiding surface and the second guiding surface The surface is formed by a convex portion provided on the aforementioned bracket. The optical information reading device according to claim 3, wherein the lens holding portion is at least a part of an outer peripheral surface having a polygonal cross section when viewed from a surface through which the optical axis passes, as the first reference surface and the second reference The way of surface action is formed. The optical information reading device according to claim 1 or 2, wherein the lens holding portion is formed to function as the reference surface when at least a part of an outer peripheral surface having a circular arc shape when viewed from a surface through which the optical axis passes . The optical information reading device according to claim 1 or 2, wherein the lens holding portion is provided with an engaging portion that is used to move the holder along the optical axis. A method of manufacturing an optical information reading device for manufacturing an optical information reading device according to claim 1 or 2, comprising: holding the lens holding portion of the imaging lens with respect to the holder for fixing the area sensor; a process in which the reference surface is in contact with the guide surface; an arm that is movable along the optical axis is assembled to the lens holding portion; and the arm is slidably attached to the guide surface Moving in the direction along the optical axis while sequentially measuring the resolution of the area sensor; in the case where the measured resolution is regarded as the peak position of the peak, the aforementioned lens in which the arm is assembled is held The work of fixing the portion to the bracket; the process of removing the arm from the lens holding portion. The method of manufacturing an optical information reading device according to claim 11, wherein the fixing of the lens holding portion to the holder is performed by moving the arm in a first direction along the optical axis The peak position moves the arm in a second direction that is opposite to the first direction along the optical axis so as not to exceed the peak position, and then moves the arm in the first direction toward the peak position. The lens holding portion is fixed to the bracket at the peak position. The method of manufacturing the optical information reading device according to the above aspect of the invention, wherein, in the process of sequentially measuring the resolution, the amount of movement of the arm when the analysis force of a predetermined value or more is measured is less than the measurement The amount of movement of the aforementioned arm at the time of the resolution of the predetermined value. An optical information reading device comprising: a region sensor that receives reflected light from an information code on a rectangular light receiving surface, and optically reads the information code based on a signal output by the area sensor, wherein the optical information The reading device includes: a first light source that emits visible light as illumination light and a second light source that emits invisible light toward an imaging field of view of the area sensor; and the first light source and the second light source along a short side of the light receiving surface The directions are configured in a column. The optical information reading device according to claim 14, wherein the first light source and the second light source are disposed such that a light receiving optical axis of the area sensor is located between the first light source and the second light source. The optical information reading device according to claim 14, comprising: an imaging lens that collects reflected light from the information code and images the light on the light receiving surface; and the first light source and the second light source are imaged relative to the image The lens is disposed to be offset in the longitudinal direction of the light receiving surface. The optical information reading device according to any one of claims 14 to 16, wherein the first light source and the second light source are mounted on the same substrate. The optical information reading device according to any one of claims 14 to 16, wherein the illumination lens for the first light source and the illumination lens for the second light source are integrally formed. The optical information reading device according to any one of the above-mentioned first aspect, wherein the irradiation range of the first light source is lower than an irradiation range of the second light source when the user observes 1 light source and the second light source.